Enhanced-performance video transmission in multicode CDMA wireless systems using a feedback error control scheme

In this paper we propose a new bounded delay retransmission scheme that enhances the reliability of compressed video transmission in multicode DS-CDMA (MCCDMA) systems. We consider H.263/H.263+ video at low data rates (i.e., <64 kbps) in an IS-95B system over slow fading Rayleigh channels. Our approach is designed to reduce not only packet loss, time delays, and complexity, but also interference effects. The latter is critical in CDMA systems. Based both on theoretical analysis and entire system simulation, we investigate the improvements in packet transmission and system capacity achieved by the new scheme, and provide results for H.263 video transmission over IS-95B. Our results show that the scheme proposed in this paper significantly improves the error resilience of video transmission over MC-CDMA systems with small additional complexity. We also introduce new techniques for the analysis of video transmission in MC-CDMA with error control based on ARQ protocols, and present the application of these techniques to the proposed retransmission scheme.